This kit will add 60cc to the original displacement of your maxi scooter (d=70mm, 73mm stroke). It includes a Nikasil-plated aluminium twin cylinder and forged pistons developed by Malossi to cope with the enormous power and typically long life of these engines. According to Malossi, a 15% increase in power is possible, which is kind of mind-blowing for an engine like that (considering the 43hp it has to begin with...).